Williams Furnace Company 2907 Blower Accessory For use with models 2509821, 2509822, 3509821, 3509822, 5009821 and 5009822. Two blowers may be used on models 5009821 and 5009822 (one on each side of the furnace) Moves air at up to 125 CFM for effective use Includes automatic and manual Fan switch and a power Supply cord Grille painted soft-white finish to match the furnace